Railway train-indicating apparatus



. point out the novel features thereof patchers office the entrance oftrainsinto Patented July 22, 1930 UNITED STATES PATENT OFFICE f CHARLESA. ianooxs, or SWISSVALE, AND LEONARD c. nrrrnnnusnt, or rrrrsnunon,

PENNSYLVANIA, ASSIGNORSQTO'1HE uNroN swrron & SIGNAL COMPANY, or V v ASWISSVALE, PENNSYLVANIA J A CO RPORATION OF PENNSYLVANIA 'RAILWArfiarN-mmcarmearranarus Application filed October 9 1929. Serial No398,300.

O ur invention relates to apparatus for indicating the movements ofrailway trains, and has for an object the provision ofmeansdespatchersoflice, with aflminimum number ofline wires. p

We will describe one formiof apparatus embodying our invention, andwillfthen in claims. The accompanying drawing is,a}diagraminatic viewshowing one form of apparatus embodying our invention.

Referring to the drawing, the reference characters 18 and 18 designatethe track rails of a stretch of railway track, which stretch is'dividedinto sections A, D andC, by means .of insulated joints 19. -Traflicthrough the middle section D is governed by two signals S and S whichare controlled from a distant point,'such.as a despatchers office,through means forming no part of our present invention and notillustrated in the pres.

ent disclosure In connection with systems of this character it becomesimportant for the despatcher to know when a train moving toward theright enters section A, and when-a train moving toward the left enterssection 0,

and the purpose of our invention is the provision of means for mdlcatingat thedesthese sections.

Section A is provided with atrack circuit comprising a battery 20 and atrack relay T .3 and section C is provided with a similar track circuitcomprising abattery 20 and a track relay T Associated with the trackrelay T is a slow releasing. relay R and associated with the track relay'1 is a slow releasing relay R -Relay RA is provided with a ick-upcircuit which passes from terminal ofa suitable source of current,through front'contact 1 of trackrelay T and the winding of relay B toterminal 0 of the same source of current. Relay R is provided with astick circuit which passes from terminal B, through back contact 6 oftrack relay T front contact 9 of relay It, front contact 3 of relay Rand the winding of ie lay R to terminal 0. Relay R is provided R in thefollowing manner.

-polarity by virtue of a polar contact of relay E to terminal 0. Whenwith a circuit whichpasses from terminal B,

through'front contact. 5 of track relayT [and the winding of relay R toterminal 0.

for indlcating the conditlons of two or more 5 track sections at adistant point, such as a ilghis relay is not provided with a stick cir-Located in the despatchers oflice is a olartrack relays T and the slowreleasing relays C are. both unoc cupied', relay P is de-energized.Assuming that a train enters section A, track relay T When the sectionsA and will become de-energized, thereby opening thepick-u'p circuit forrelay R and since the stick circuit -'for this relay is open at coni zedrelay P, which relay is controlled ythe tact 6 of track relay T relay Rwill likewise 7 become de-ener ized and after a given intervalof timetsfrontcontacts will open. During the interval between the opening ofrelay T and the opening of relay R relay P iyill be supplied withcurrent of normal w circuit which passes the right-hand terminal of abattery E, through-back contact 2 of relay T front contact 4 of relay Rfront contact 10 of relay R,

thatrela'y, so-that relay P will become de-en- While relay P isenergi'zed, apickergized. up circuit-willbeclosed for an indicationrelay E, which circuit passes from terminal B,through neutral contact12.of relay P, Eve-13"v of relay P, and the winding relay E closes, it'willclose a stick circuit for itself, which circuit passes from terminal B,through a normally closed push button contact K, front contact 16 ofrelay E and the winding of relay-E to terminal 0. It-foL 'lows thatrelay E will remain energized until push button K is operated to openthe stickcircuit. While relay E i '-,energized, an indication lamp L\will be ligh ged by virtue of a circuit which includes front contact 17of relay E front contact of relay T ,.line wire 21, winding of relay P,and line wire We'will now assume that a train enters section D-G. Thiswill cause track relay T to become de-energized, thereby opening thecircuit for relay B9, so that the latter relay will also. become(lo-energized, whereupon its front contactswill open after a giveninterval of time. During the interval between the opening of relay T andthe opening of re-' lay R current of reverse polarity will be suppliedto relay P by virtue of a circuit which passes from the left-handterminal of battery E, through front contact 11 of relay R back contact8 of track relay T line wire 21, winding of relay P, and line wire 22 tothe middle-point of battery Er This circuit 'will be Opened at contact11 assoon as relay R releases. While the circuit is closed, relay P will.be energizedin such direction that its polar contact 13-13 is'closed,there-- by closing the pick-up circuit for a relay'E and this in turnwill'close a stick circuit for the same relay through the push buttoncontact K. W'hile relay E is energized, an indication lamp L will belighted by virtue of for relay Rt E whioh'in turn will supplied to thewinding of relay P through front contact 11 and back contact 8, so thatrelay E will become energized and will in turn energize the lamp L toindicate that the track section C is occupied. \Vhen relay R releases,it will open at contact 9 the stick circuit for relay R and du'ring'th'einterval between-the release of relay R and the re lease of relay Rcurrent of normal polarity will be supplied to the winding of relay P,the circuit being from the right-hand terminal of battery E, through.back contact 2 of relay T front contact 4 of relay R back contact 10 ofrelay R back contact 7 of re lay T line wire 21, winding of relay P- andline wire 22 to the middle point ofbattery E. This will cause relay P tobe energized in such directiongas to close its polar contact 13-43",thereby energizing indication relay cause lamp L to be lighted toindicate-that section A is occupied bya train. Of course, each lamp Land L may subsequently be extinguished by opening the push buttoncontact K.

It will be seen from the foregoing, that we have provided means forindicating the conditions of track sections A and C in the despatchersoffice by means of only two line wires 21 and 22. Y

Although we have herein shown and decluding a source ofcurrent of relaysT andT for said two sections respectively, slow releasing relays R and Rfor said two track sections respectively, a circuit for relay Rcontrolled by a front contact of track relay T a pick-up circuit forrelay R controlled by a front contact of track relay T astick circuitfor relay R controlled by a back contact of track relay T and a frontcontact of relay R a polarized relay, a circuit f for thewinding of saidpolarized relay inone polarity and a back contact of track relay T asWell as a front contact of relay R and front contacts of relays R and Tall in series, a branch for said circuit around the front contacts ofrelays R and T and including back contacts of the same relays connectedin series, a second-circuit for the winding of said polarized relayincluding a source ofcurrent of the other polarity as well as a frontcontact of relay R and a back contact of relay T con-' nected in series,and indication means controlled by said polarized relay.

2. In combination, two sections ofrailway track A and C, track circuitsincluding track relays T and T for said two sections respectively, slowreleasing relays R and R for said two track sections respectively, acircuit for relay R controlled by afront contact of track relay T, apick-up circuit for relay R controlled by a front contact of track relayT, a stick circuit for relay R controlled by a back contact of trackrelay T and a'front contact of relay R a polarized relay, a cir-' cuitfor the winding of said polarized relay including a source of current ofone polarity and a back contact of track relay T as well as a frontcontact of relay R and front contacts of relays R and T all in series, abranch for said circuit around the front-contactsof relays R and T andincluding back contacts of the same relays connected in series, a secondcircuit for the winding of said polarized relay including a source ofcurrent of the other polarity as well as a front contact of relay R andaback contact of relay T connected in series, two indication relays, apickup circuit for one indication relay including a neutral contact andone polar contact of said polarized relay, a pick-up circuit for theother indication relay including the neutral contact and the other polarcontact of said polarized relay, a stick circuit for each indi-L cationrelay including a normally closed push button contact, and twoindicators controlled, track A and traclrcircuitsincluding track I bysaid two indication relays respectively} 3. In'combination, two sectionsof track A and C; track cir'cuitsincluding track relaysT and T G forsaid two sections respectively, a polarized relay, two'circuitsfor saidpolarized relay including two sources of our.-

- circuit has been closed for the aforesaid short rent of oppositepolarities, means for closing the first circuit for said polarized relayfor 'a short interval of time when track relay T opens, means fdnclosingthe second circuitior said polarized relay for'a short interval of timewhen track relay T opens, means operating if both track relays opensimultaneously -to delay the closing of said second polarized relaycircuit until the first time interval, and indication means con trolledby said polarized relay.

-' track A andC, track circuits including track relay R controlledbyxa{front ("contact of tion meansfbrsaid track sections controlledrelays T and 'l for said two sections-respectively, slowreleasing-relays R andiR for said two track-sections respectively, acircuit 'for relay R controlled-byajfront' con tact of track relay T apickup circuit for track relayT -g a 's tickcirc'uit for relay Rcontrolled by aback contact oftrackrelay; T and a front cont-act'oflrelay R and indicajointly by said track relays and'slow releasingrelays. 1 f

5. In combination, two sections 'ofrailway track A and C, track circuitsincluding track relays T5 and T for said two sections rerelay's'T and Tfor said twosections re spectively, slow releasing relays R and R forsaid two vtrack sections respectively,a

circuit for relay R controlled by a front contact of track relay T apick-up-circuit forrelay ltd-controlled by a front contactof track relayT, a stick circuit for relay R controlled by a back'contact of trackrelay T and a front contact of relay R,.a polarized relay, meansoperating 'whe'n a train enters section A to supply said polarized relaywithcurrent of one polarity during the intervalbetween the opening ofre-' lay T and. the opening of relay R means goperating when a trainenters section 0 to supply'said polarized relay withv current of theother polarity during the interval be-- tween the opening of relay T andthe open- "ing of relay R means-operatingwhen two trains enter said twosections simultaneously to'sup'ply said polarized relay-with current ofthe second polarity during the interval bepolarity, during the intervalbetween the opening of relay R and the opening of relay -R twoindication relays, a pick-up circuitv for one indication relay includinga neutral contactand one polar contact of said polar-" ized relay,a'pick-up circuit for the other indication relay including the neutralcontact and the other polar contact of said polarized relay, .a stickcircuit for each indication relay'including a normally closed pushbutspectivdy,gslow'releasingrelays RA and m ton contact, and twoindicators controlled for said two track sections respectively, "a

circuit for relay R controlled by a front contact oftrack relay T, apick-up circuit for relay R controlled by a front contact of trackrelayT4, a-stick circuit for relay It Ibetwe'cn .theropening of relay. T? andthe opening of relay Rf, means operating when a train enters section Gto supply said polarized relay with currentv of the other polarityduring the interval between the opening of relay T and the openingofrelay R means operating. when twotrains enter said two sections"simultaneouslyto supply saidpola'riz'edrelay with currentof the sec-.

0nd polarity during the interval between the opening vof relay T andtheopening of relay R and-to subsequently supply the-polarized relay withcurrent of the first polaritydur ing the interval between the opening ofre lay R and the openingoirelayR and in dication means for said sectionscontrolled by said polarized relay.-

6. Incombination, two sections of railway 1 by said two indicationrelaysrespectively.

In testimony whereof we aifix our signatures. CHARLES A. BROOKS.

- LEONARD C. 'RI.TTERBUSHL v

